dan springer live in seattle where teams assem being the 787. the fa amp wants proof that batteries are safe before they can fly again is that what we can report? >> that is right, bill. the f.a.a. issued what they call an emergency air worthiness directive to potential fire risk in the 787 and grounding the u.s. airliner fleet grounded six planes all owned by united airline. this is a big change for the f.a.a. just last friday officials said the 787s were completely safe. even as they announced a comprehensive review of the plane's electrical system. even though analysts tell me they don't think the issue in japan today was all that serious in terms of the threat to the aircraft coming down. the feds have seen enough to jump in. all the recent problems the way the plane is powered. the lithium ion batteries are used to provide backup electricity. this directive will mean that united will be scrambling to move flights around -- planes around and flights getting cancelled. >> bill: how big of a problem is this for boeing. >> they may be getting c